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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dbd2afee1f540463ef18d4a75612779f879c7bddfa72f58ad26ea737755dd69' 
  AND token = 'tA4URJteoZ8F4po7jEx3vY6rd4eKCHS0cOmFHc0CshA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}